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cfg_if! { if #[cfg(target_pointer_width = "64")] { s! { #[repr(align(16))] pub struct max_align_t { priv_: [f64; 4] } } } else if #[cfg(target_pointer_width = "32")] { s! { #[repr(align(16))] pub struct max_align_t { priv_: [i64; 6] } } } }